I worked with a French guy in Amsterdam. His parents were Portuguese, but he was born and raised in France. As far as he was concerned, he was French.
As I understand it, that’s a French thing specifically, not just a non-USian thing. Like, if you’re a citizen of France, you’re expected to be French and assimilate into that culture, no matter whether you’re a native Parisian, you moved there from Algeria in the '60s, or you’re from some random other place and got citizenship via the French Foreign Legion. It’s a specific sort of national ideology that’s different from the American “melting pot” one.
I applaud your idealism, but the tricky thing is that if you stop measuring race, then you also stop being able to measure institutional racism. That’d be great for the closet racists who want to pretend that it doesn’t exist, but it does still exist and we really need to be able to quantify how well measures to stop it are actually working.